ARTICLE
UTC
Abbreviation for Coordinated Universal Time . Basis for expressing
worldwide time data. The UTC reference time is not a local time
zone, but a general reference time based on atomic time standards, from
which the times of all local time zones are derived. UTC is
defined in such a way that it corresponds to Greenwich Mean Time
( GMT ). The UTC reference time differs slightly from
Universal Time ( UT1 ), which is linked to the rotation of the
earth and defined as the 86,400th part of the mean solar day. By using
leap seconds, this difference is kept down to less than 0.9 seconds a
year.
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